HR: 14:30h
AN: A53B-05    [Abstracts]
TI: Trace Gas Trends in the Stratosphere: 1991-2005
AU: * Elkins, J W
EM: james.w.elkins@noaa.gov
AF: NOAA/CMDL, 325 Broadway, Boulder, CO 80305-3328 United States
AU: Moore, F L
EM: fred.moore@noaa.gov
AF: NOAA/CMDL, 325 Broadway, Boulder, CO 80305-3328 United States
AU: Moore, F L
EM: fred.moore@noaa.gov
AF: CIRES/University of Colorado, Campus Box 914, Boulder, CO 80309-0914 United States
AU: Dutton, G S
EM: geoff.dutton@noaa.gov
AF: NOAA/CMDL, 325 Broadway, Boulder, CO 80305-3328 United States
AU: Dutton, G S
EM: geoff.dutton@noaa.gov
AF: CIRES/University of Colorado, Campus Box 914, Boulder, CO 80309-0914 United States
AU: Hurst, D F
EM: dale.hurst@noaa.gov
AF: NOAA/CMDL, 325 Broadway, Boulder, CO 80305-3328 United States
AU: Hurst, D F
EM: dale.hurst@noaa.gov
AF: CIRES/University of Colorado, Campus Box 914, Boulder, CO 80309-0914 United States
AU: Ray, E A
EM: eray@al.noaa.gov
AF: CIRES/University of Colorado, Campus Box 914, Boulder, CO 80309-0914 United States
AU: Ray, E A
EM: eray@al.noaa.gov
AF: NOAA/Aeronomy Lab, 325 Broadway, Boulder, CO 80305-3328 United States
AU: Montzka, S A
EM: stephen.a.montzka@noaa.gov
AF: NOAA/CMDL, 325 Broadway, Boulder, CO 80305-3328 United States
AU: Butler, J H
EM: james.h.butler@noaa.gov
AF: NOAA/CMDL, 325 Broadway, Boulder, CO 80305-3328 United States
AU: Fahey, D W
EM: dfahey@al.noaa.gov
AF: NOAA/Aeronomy Lab, 325 Broadway, Boulder, CO 80305-3328 United States
AU: Hall, B H
EM: bradley.hall@noaa.gov
AF: NOAA/CMDL, 325 Broadway, Boulder, CO 80305-3328 United States
AU: Atlas, E
EM: eatlas@rsmas.miami.edu
AF: University of Miami, Rosenstiel School Of Marine And Atmospheric Science, Miami, FL 33149 United States
AU: Wofsy, S C
EM: scw@io.harvard.edu
AF: Harvard University, 29 Oxford, Cambridge, MA 80305-3328 United States
AU: Romashkin, P A
EM: pavel@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AB: The first NOAA airborne gas chromatograph measured chlorofluorocarbon-11 (CFC-11) and CFC-113 during the Arctic Airborne Stratospheric Experiment in 1991-1992. In 1994, we added nitrous oxide (N2O), sulfur hexafluoride (SF6), CFC-12, halon-1211, methyl chloroform, carbon tetrachloride, methane, and hydrogen. NOAA scientists have since operated five airborne gas chromatographs on NASA airborne platforms, including the NASA Jet Propulsion Laboratory (JPL) balloon gondola and ER-2, WB-57F, DC-8, and NASA Altair Unmanned Air Vehicle (UAV) aircraft. Using these in situ measurements and tracer-tracer correlations from flask observations for the unmeasured halogen species (HCFCs and methyl halides including methyl chloride and bromide), we have estimated trends of total chlorine and bromine in the stratosphere. The determination of inorganic equivalent chlorine (Cl + 45*Br) requires the trend of tropospheric equivalent chlorine and the mean age of the parcel of stratospheric air. In general, there is good agreement between the mean age of the air mass calculations using carbon dioxide and SF6, except for regions of extreme down welling of mesospheric air where SF6 is consumed. Tropospheric trends of the methyl halides have been compiled against stable standards. We operated a airborne gas chromatograph on the Sage 3 Ozone Loss Validation Experiment (SOLVE-II) mission from Kiruna, Sweden during 2002. It measured the major HCFCs and methyl halides, so that these compounds do not have to be estimated from tracer-tracer correlations in the future. In 2005, we have added a new lightweight airborne instrument (<25 kg) that can measure CFC-11, CFC-12, halon-1211, SF6, N2O, and ozone. This instrument can operate on small or UAV aircraft and will be used for Aura satellite validation. This presentation will show trends for selected trace gases and our estimates of total equivalent chlorine stratospheric trends since 1991.
UR: http://www.cmdl.noaa.gov/hats/insitu/cats/ccly/
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0340 Middle atmosphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2005 Joint Assembly